Drill.



R. P. OBRIEN.

DRILL.

APPLIOATIOR FILED EXE y@ @www UNITED STATESATENT OFFCE.

ROBERT- 1. OBRIEN, OF HOUSTON, TEXAS.

Application tiled lune 11, 1912. Serial No. 762,975.

Be it lknown that I, ROBERT PQOBRIEN,

acit-izen of the United States, residing Houston, in the county of Harris and State of Texas, have invented certain new and useful Improvements in Drills, of wh-ichthe following isa specification. i

. moved from and replaced on the drill pipe,

without removing saidpipe from the well.

' NVith the above and other. objects in view,

theinvention'has particular relation to certain novel features of construction, operation and arrangement of parts, an example of'which is given in this specification and illustrated in the accompanying drawings, wherein- Figure 1 is a sectional sid-c elevation of the drill showing the same secured to a drill stem, which. isl shownI in section, and also showingta fishing tool engagedover the head of :the drill rod. Fig.E 2 is an edge view of the 'drill and also showing thel drill stem in section. Fig. 3 is a plan view of ,the block in which the drill bits are'tul-l 'crumed, and Fig. Ll is a' side 'elevation of' l 'bushing 2, and when the block 15 .is foro.

the bit operating blocle Referring nowl/more 'particularly to the drawings, wlierein like numerals of reference designate similar parts in each of the. tigures, the numeral l refers to' a drill stem such as is used ordinarily in rotary drillingl and which is. rotated by the ordinary rotary, (not shown.) To the lower end of this stem is screwed a tubular bushing 2,-

the lower end ofthe bore ofwhich is slightly reduced, forming an annular. shoulder 3 which is designed to limit the downward movement of the fulcrum block 4.. This block 4 has a vertically extending slot 5 through which thebits t and 7 extend and a' pin 8 extends through said block and the "Shanks of said bits upon which the bits are pivoted.A The bits aretoothed at their lower or cut-ting ends and are elongated into up .wardly extending' shanks 9 and 10, the

Shanks being' offset relative 'tio' the bits proper, so asto form shoulders 11 and12 upon'which the lower end of the bushing rests when said .bits are in position for service. The lower end of the bustling 2 is vsaid bits.

lthrough which the outer edgesof-,t

shoulders 11 and 12 of the bits 6 andf-,Wi

Patented Apr. 1,

DRILL.

1,058O13 Specification of .Letters Patent.

' To dit -w/wm. it mag/ concern .Y

provided with two downwardly braces 13 and' 14 arranged behind the rev-1" spective bits 6 and 7 vand bracing there-fvv against for the purpose of strengthening .60

vArranged within the bushing Qiand above u 'I f thel block 4 is a bit-operating block 15. e

lower end of this block is provided withaf vertically extending slot 16 into whichthe- ,65

` ,upper ends of the bit shanks 9 and. 101e-X'- tend and this block is provided on eachlside with laterally extending v Aslots 17,... ,17

-position for use. The projectingzportions are curved in opposite directions so that/ias the .block 15 is moved upwardly the pin 21 will slide along in the slots 19 and 2,0 and... 80 force the upper ends of the Shanks in ,afco-,f-

inciding position, which will in turnU-.exertp a similar effect upon the bits 6 and1-7',fand the upper ends ofvsaid Shanks will be ,disegni gaged rom'the recesses 18, l8 ,andft he be disengaged from the lower end ,oftheiV downwardly, the pin will ergert; an"oppo f, site effect and force the upper ends of-..; th Shanks into the recesses 18, 18. andiaal'i'se-g the. shoulders 11 and 12 to. engage under.-V neat-h the lower end of bushing 2.

Into the upper end of the block 15,7Ilhave; i i

screwed 'a shaft 21 whose upper; end carriesA a head 22. When it is desired to rer'nove-thev bit from lthe drill stem, a tishingtool23nofw any well known construction, is ,engaged 1 overthe' head 22 and anupwardpullffexe'` o erted thereon through a suitable cable,f.(notf1o shown.) This upward pull operates'to ele-'ifi vate the block 5 and the pin 21,carriedl." thereby, and to disengage the bitsffroml the-*1 bushing, as hereinbefore describedwandtlile'' drill may then be withdrawn through-'the :flo casing without removing said casing,` and as is obvious, the drill may be lowered-in"EL the casing and secured imposition in the'u bushing in the manner hereinbetore set forth@ Surrounding the `shatt 2l and resting upon the block 15 is a plurality .of weights lower end of the slots 19 land 20 and thus secure the bits in position for service.

In order to remove the bits now in common use from the drill pipe, it is necessary to Withdraw the ent-ire pipe from the bore, but a bit of the constructionherein described and illustrated in the drawings accompanying this specification may be withdrawn from or secured on to the drill pipe while the same is suspended inthe bore and a bit of this character may thus be removed and replaced in much shorter time and wthless laborthan wouldfjbe the vcase in removing and replacing bits of thi's character now in common use. y

.1. 'A device of the character described includin asuitable bushing and a ,bit support t erein, a plurality ofbitspivotally mounted' in said support and arranged to engage-with thellower'end of saidl bushing and means engagi .with said bits for disengagn the'same` m. said bushingf.

2. cluding a bushing and a bit support therein, a plurality'of bits pivotally mounted in said support and engagin a ainst the lower end of the bushing and ioced against vertical movement therein, a means connected to said bits for disengaging said bits vwhereby they may be elevated vertically through said bushing. t A

3. A device of the character described including a suitablebushing and,a -bit support therein, a plurality of bits'arranged to lock against said bushing, Shanks carried by4 said bits and pivotally secured to said support and a vertically movable mechanism secured to said shanks and arranged to disengage the bits from the bushingv as said mechanism is moved upwardly...

' 4. A device of the character described composed of a suitable bushing, a vertically movable bit support carried therein, a plurality of bits secured against vertical movement by the lower end of the bushing, elongated Shanks integral with the bits and pivotally secured to said support, each of said Shanks being provided with an arcuate slot, a block into which saidshanks e'xtend and af pin extending through said block and extending through the slots in said bit Shanks, a means for elevating said block whereby said bits are disengaged from said bushing and Withdrawn within the same.

5, A- device of the character described composed of a suitable bushing having an evice of thel'character described in- .with shoulders, arranged to engage"A 'annular recess around the inner wall thereof, a 4vertically movable bit support carried 60 therein, an annular shoulderrnar the lower` end of the said bushing and projecting inwardly therefrom upon which said support normally rests, a plurality of bits, provided with shoulders, arranged to engage against the lower end of said bushing, elongated Shanks integral with the bits and pivoted to saidvsupporteach of said Shanks bein y provided with an'arcuate slot, said slots diverg-A ng from each other, a block into which said Shanks extend, said block being provided with lateral slots through which the outer edges of the shanks project into the recess in the inner wall of said bushing when said bitsare in position for use, a pin extending through lsaid block and also through the slots in said Shanks, land a rod secured to said lblock for elevating the Same whereby said pin. is moved upwardly in' the arcuate slots and the bits ,disengagedV from said bushing and withdrawn wlthin the same.

6. A device lof the character described composed of a suitable bushing having an annular recess around the inner wall thereof, a vertically movable bit support carried therein, an annular shoulder near the lower endA of the said bushing and projecting inwardly therefrom upon which 'saidsupport normally rest-s, a plurality of bits, provided the lower end cisaid bushing braces sgralwith said bushing and extending down` wardl therefrom and bracing against-saw bits, e ongated shanks integrawlth tigen-bitsv v and pivoted to said' support, each'of vsaid shanks being provided with an arcuate slot,

said slots divergin from veach. other a block' into which said s anks extend,saldblo'g'skVY being provided with 1at`eral lots'through into the recess in the innerwall "id ing when said bits are in position or' ab?" pin extending through said block and also through the slots in said Shanks, and a-Krod'i" secured t6 said block for elevatingthe same, '105 whereby said pin is moved-'upwardly inthe fj' arcuate slots and the bitsxdisen'gaged -from said bushing and withdrawn within the same. In testimony whereof I have Vsigned my 110 name to this specification in the presencel of two subscribing witnesses. ROBERT P. OBRIEN. Witnesses:

MAY MoN'rGoMERY, H. R. DECKER. 

